Ask HN: Was my submitted post nerfed / hidden / shadowbanned?

I don't submit a lot of content, but this morning I submitted this link to a WaPo article on e-cigarette addiction.

https://news.ycombinator.com/item?id=20535474

It looks like it has been hidden from the front page / subsequent pages despite what appears to be a ranking upvote.

I don't really care about the visibility, but I am curious about the moderation that might have resulted in this content getting shadowbanned.